<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <MyShop
          v-for="(item, index) in goodList"
          :key="index"
          :obj="item"
          :index="index"
          @remove="remove"
          @add="item.num += 1"
          @sub="item.num -= 1"
          @change="item.checked = $event"
        ></MyShop>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ total }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import MyShop from '@/components/MyShop'

export default {
  methods: {
    remove(id) {
      this.goodList.splice(id, 1)
    }
  },
  components: {
    MyShop
  },
  computed: {
    total() {
      return this.goodList.reduce((prev, item) => prev + item.price * item.num, 0)
    },
    isAll: {
      get() {
        return this.goodList.every(item => item.checked === true)
      },
      set(value) {
        return this.goodList.forEach(item => (item.checked = value))
      }
    }
  },
  data() {
    return {
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false
        }
      ]
    }
  }
}
</script>

<style></style>